Burglar alarm



May 5, 1925. 1,536,868

A. H. KELLER BURGLAR ALARM Filed March 21, 1924 Ill Ill ll (SWWM7 Arid/M05 Y5.

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Patented May 5, 19 2 5.

UNITED STATES; PATENT orrics.

H. KELLER; or PHILADELPHIA, PENNSYLVANIA, nests-non. or ONE-HALF TO GEOBGEEAGEY, or. rHrLAnELrrrIA,rnN sYLveNIa.

AUGUSTUS BURGLAR ALARM.

' Application'filedMarchZlylSQQ. Serial No. 700,753.

To all 1072.077? it may concern:

Be 1t known that I, AUsUsTUs H. KELLER, a citizen ofthe United States, residing at Philadelphia, county of Philadelphia, and

State of Pennsylvania, have invented a new and useful Improvement in Burglar Alarms, of which the. following is a full, clear, and exact description, reference being had to the accompanying drawings, which form a part of this specification.

a simple mechanically operable burglar alarm which is attachable to an ordinary window composed of upper and lower sashes slidable in parallel planes and which will be automatically operated whenever there is any relative movement of the two sashes away from a position of closure; that is,-

whenever the lowersash is raised or the upper sash lowered. Alarms of this character. are known in the art, my object being to simplify the construction and also to pro vide a construction which will produce, when operated, a penetrating sound of. a peculiar character.

A preferred embodiment of the invent-ion is shown in the accompanying drawing, in whicl Fig. 1 isan elevation of my alarm. applied to a window, looking toward the window.

Fig. 2 is an elevation taken at right angles 1, the two window sashes showing in section.

Fig. 3 is a detail side View, partly in section, of the spring-containing rotary box.

Fig. 4 is a detail View, in perspective, of the hub connecting said box and the toothed wheel and onwhich the cord is wound. I

Fig. 5 is a side View of the rotatable toothed wheel.

To a bracket (r is secured a shaft I). able on shaft b is a box 0.

spring is normally unwound (not under tension).

toothed wheelv c is a hollow hub or sleeve ,1 havin'g,at opposite ends, projections f and f Projections f extend through slotsc in one wall of the box and are bent against the inside of the box wall. Projections f extend through slotse. in the toothed wheel and are bent against the outside face ofthe wheel. By these means-box 0, sleeve f and p Within box 0 is a coil spring (i one end of which is secured to the box and the other to the shaft. This Also turnable on shaft 7) is a toothed, wheel 6. Extending between box 0 and toothed wheel 0 aresccured together so as toibe turnable in unison.

. Secured to bracket (is is a sound box, the same comprismg a hollow body 9 and a hollow, opemended horn-shaped projection 71.

Secured to thesound box is a flexible finger 2' engaging the toothed periphery of wheel. a.

Bracket (1. is mounted on the lower sash a: of a window. Preferably, the upper face of V the lower sash is provided with a cleat is, The object of myinvention is to provide and bracket (0 is secured to the sash by slid.-' ing the horizontal arm of the bracket under the cleat,

TWound around the sleeve 7 is a cord j, one end whereof is secured to the sleeve and the other end to the lower part of the upper sash y, as by means of hook m. v

If the lower sash m is raised, or the upper sash'y lowered, from the positions that the sashes occupy when the window is closed, cord j is unwound (winding up spring and rotates sleeve f, thereby rotating wheel e. Rotation of wheel a causes finger c' to snap over the teeth of the wheel and produce. a clicking sound. This sound is greatly magnified by reason of the attachment of finger z'to the sound box. In fact, the sound produced is quite penetrating.

hen the lower sash as or the upper sash :I/ is returned to the position occupied by the sashes when the window is closed, spring (Z unwinds and re-winds cord 7' on sleeve f.

Having now fully described my invention, what I claim and desire to Patent is: j

1. The combination with the sashes of. window; of a mechanical burglar alarm protect by Letters comprising a bracket secured'to one-window sash, a toothed wheel turnable on the bracket, a sound box secured to the. bracket, a flexible finger secured to the sound box and engageable with the teeth of the wheel, and means connecting said wheel with theother sashand adapted, in the movement of either sash, to turn the wheel and cause said finger to click over the teeth thereof: the sound box comprising a hollow body and a hornopeu at both ends, one open end of the horn com- -1nunicating with the. hollow interior of the, sound box body.

2. The combination with the sashes of a window; of a mechanical burglar alarm comprising a bracket secured to one window sash, a shaft fixed to the bracket, a. hollow box and a wheel turnable on the shaft, one

wall of the box and the body of the wheel being slotted, a hollow hub enclosing the shaft between the box and wheel projections on the ends of the hub extending through the slots of the boxwall and wheel respectively and bent angular-1y so as to fixedly connect the box and wheel, a coiled spring within the box one end of which is secured to the box and the other end of which is secured to the shaft, a cord secured to the other sash and wound about the hub, and audible alarm mechanism operable by the wheel in its turning movement.

3. The combination with the sashes of a window, of a mechanical burglar alarm comprising a bracket secured to one of the sashes,

a shaft secured fixedl to the bracket, a wheel and a hollow box turnable on the shall, a hub between the wheel and box, opposite ends of the hub being secured to said wheel and box the hub, box and wheel thereby beine' turnable in unison, a spring within the box, one end fixed to said shaft and the other end secured to the box, a cord wound around said hub and secured to the other sash, and alarm lnechanisn'r carried by the bracket and operated by said wheel.

In testimony of which invention, I have hereunto set my hand, at Philadelphia he, on this 18th day of March 1021-.

AUGUSTUS H. KELLER. 

